Method of making double-page multicolor maps



W. H, GREELEY.

METHOD OF MAKING DOUBLE PAGE MULTICOLOR MAPS.

APPLICATION FILED MAR.26. 1921.

WILLIAN H. GREELEY, 015 i Eva/TON, lvEASSAGHUSETTS, ASSIGITOZ-t T0 GINN AND COMPANY, OF BOSTON, llZI-LSSACHUSETTS, A OQIPAETIIERSHTP.

METHOD OF IVIAKTNG DOUBLEJPAGET T'ULTIGOLOR IX'TAES.

Application filed March 26, 1521.

T 0 all whom it may can 067% Be it known that I, NILLIAN H. GREELEY, a citizen of the United States, residing at Newton, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Methods of Making Double-Page Multicolor Maps; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to an improved method of making double-page multi-color maps.

When a double page map is inserted in a sewed book, it is folded and pasted on the edge of a guard or the back margin of a page so that when the book is opened, the map extends continuously from side margin to side margin of the sheet. Also when a double-page map is inserted in astitched book, it is pasted on the edge of a guard or upon the inner margin of one of the leaves. Then when the book is opened and the map spread out, it extends as in the sewed book, from side margin to side margin of the sheet. These methods'of binding in a double-page map are expensive because of the additional labor involved in tipping in the map. The object of this invention is to produce adouble-page map adapted to be bound into the book in the same manner as the leaves or signatures of the book, thereby avoiding the labor of pasting, and reducing the expense of making the book. To this end the present invention contemplates making double-page multi-color maps in two parts, and in printing those two parts on one sheet of paper separated from each other double margin distance, so that when folded, the map is adapted to be bound into the book in the usual manner and the two adjacent portions of'the map are correctly positioned with relation to each other. The invention consists in the method hereinafter described and particularly defined in the claim.

The accompanying drawing is a diagrammatic illustration of the control impression of a double-page multi-color map.

According to the present invention the double-page map consists of two plates, the one for printing the control impression 1 for the left hand portion of the map, and

Specification of Letters Patent.

Serial No. 56,017.

the other for printing the control impression 2 for the right hand portion of the map. These two control impression plates, having been finished in the usual manner, are placed in correct relative position to each other, double margin distance apart, that is, distance such that when the book containing the printed map is opened, the adjacent edges of the two portions will be close to each other. The two plates are then united together while they occupy that position by a strip of metal soldered to the adjoining edges of the two plates. As a modification, the two plates might be united together in other ways, as, for example, by being tacked to a block. The two plates thus united together are then used for printing the maps, or, more often, are used in making the electrotype which, in turn, is used to print the control impression of the map; that is, the impression to which the color impressions are registered.

After the control impression has been printed from the plate as above described, the paper receives the successive color im pressions. Each color impression for this map is made from two separate plates, one for the right hand and one for the left hand portion of the control impression, and to secure the proper register of the colors with the control impression, the color plates for the separate halves of the map are sepa rately brought into register each with its corresponding control impression. The first color impression is then printed. Succeeding color impressions are similarly registered and printed, each color impression being made from two separate plates. As many color impressions follow the control impression as may be required for the particular map in process.

When the printing is done, the two pages of portions into close and correct position with relation to each other, so that the person reading'the map can easily move his eye from one inner map edge to the other inner map edge, being sure that the relative position of the two map edges is correct and the places on the two maps are accurately positioned with relation to each other.

The importance of this improvement flows from the insurance of correct relative position of the two map portions, which is secured by having the control impression for the two maps made from a single plate. Since the control impression for the two map portions correctly positions the two parts of the map with relation to each other, it inevitably follows, color register being secured, that the succeeding impressions bear correct relative position with relation to each other. The correct relation of the two map portions to each other having beensecured by printing the control impressions from a single plate, in accuracies of folding or trimming the outer margins will not affect the relative position of the two map portions.

While this invention is susceptible of use in the manufacture of a sewed book, the use of a divided map would ordinarily be incompatible with the appearance of such a book. Therefore the principal utility and value of this invention is found in stitched books in which by reason of the different style or" construction employed it is con sistent to use a double page map in two parts. And the present invention, by insuring absolute accuracy in positioning the two parts of the map with relation to each other, makes it possible and practicable to produce a satisfactory map in two parts for use in a stitched book. Furthermore, this invention contributes to producing a much more durable book by making it possible to bind in the map in the same manner as, and along with, the sections of the text.

Having thus described the invention, what is claimed is: p

The method of making double-page multicolor maps which consists in making two separate plates for each half of the map, 'lly uniting together the two plates to constitute a control impression plate, or to be used in making such plate, printing from such. control impression plate the control impression, registering two separate plates oi the next color impression separately with re lation to the two portions of the control impression, printing such second color impression in register with the control impression, and repeating the color printing steps for the several successive color impressions.

TIL-LIAN H. GREELEY. 

